Different countries will have different tax rates. There is no single "standard" tax rate for socialism. Each country that uses a socialist system sets their own tax rates. Like within the US, there may be different tax rates for healthcare, import/export, sales, payroll, etc. For example, food tax where I live is 4.5%. Payroll tax is 33%. Self-employed income tax is 15%.
You can find this information by searching the internet using search terms like, "Canada tax rate" or "Canada income tax rate." Australia, the UK, Norway, Sweden, Finland and most industrialized nations other than the U.S. have socialized healthcare.